Registering for the Forum

We require a human profile pic upon registration on this forum.

After registration is submitted, you will receive a confirmation email, which should contain a link to confirm your intent to register for the forum. At this point, you will not yet be registered on the forum.

Our Support staff will manually approve your account within 24 hours, and you will get a notification. This is to prevent the many spam account signups which we receive on a daily basis.

If you have any problems completing this registration, please email support@jackkruse.com and we will assist you.

The bulbs with the closest spectra to sunlight I've found are ceramic metal halide grow lights. The problem with them is you need a ballast that would put out an electromagnetic field, and that usually costs around $200-300.

Dan2, those bulbs from Home Depot are not full spectrum, but maybe they are ok with Jack because the kelvin is below 3000. I am still unclear if low kelvin and amber is preferable over full-spectrum with a higher kelvin. The lowest kelvin in a full-spectrum bulb I found was 3000 and it was an incandescent. I found these amber bulbs at 2200 kelvin on amazon smile: https://smile.amazon.com/gp/product/B01M0WJC9A/ref=oh_aui_detailpage_o00_s00?
ie=UTF8&psc=1

The kelvin temperature rating and the frequency spectra vary in sunlight through the day. Low kelvin around sunrise, about 5700 at noon, and lower again around sunset. And the mixture of colors change, too -- more red in the morning and more blue late in the afternoon, plus UVA usually an hour or two after sunrise until an hour or two before sunset.
My point is that if you're trying to use lightbulbs that are close to the natural sunlight, the lightbulbs (or maybe mixture of them) you'd want to use will vary through the day too, so whether those vintage Edison style bulbs at 2200K with more amber or bulbs at 3000K+ with more blue would be the better choice depends on where you live and the time of day. I like the 2200K Edison style bulbs because they have some blue (if I use them at night, putting blue blocking glasses on shows that) but include more red and orange than most incandescents, and disproportionate red and orange in an artifical light source isn't a big deal compared to the other colors and can even be beneficial in counterbalancing the effects of artificial blue. The blue and the yellow they put out aren't ideal at night, but for mid-morning or mid-afternoon that's ok.
And for around noon, that's when you'd want an incandescent with a higher kelvin rating.
As for adding another bulb for the UVA, what's called a "black light blue" or "BLB" bulb will have less blue than a regular "black light", but still a spike of blue in addition to the purple and UVA range. Black light blue CFLs can be found at Batteries Plus or online easily. Effects of artificial blue are offset by plenty of red, and Jack has said that the UVA on the skin offsets the effect of the flicker rate of CFLs (plus helps the body's DC current), so you could add a black light blue CFL to the 2200K Edison incandescent during the mid morning and mid afternoon, or use the black light blue CFL with a higher kelvin incandescent around noon, and have the mixture of color frequencies plus UVA similar to sun at those times of day.

I think I was wrong about the color temperature around sunset being low like around sunrise. Or, there are other details that should be included I didn't know. I'm not sure what to conclude about the info but here's some I found.

Someone asked Dr. Jack Kruse on the Vermont 2017 video on the comments section: "Why are sunsets so important to a mitochondriac?"

Dr. Jack Kruse replied:
"Because the color temperature of PM light rises and this is the blue crescendo photic stimulus to the melanopsin/retinol system and signals the origin of activation of melatonin during darkness after its aromatic rings were initially excited by AM IR-A and UV-A light. This is also a big leptin and amylin trigger too for the same reasons."
______________

Some more info from Jack:

https://jackkruse.com/reality-2-can-life-skirt-uncertainty-principle-second-law-thermodynamics/
"The photons come in all colors or frequencies because the sun’s light varies by location altitude and time of day. For example, the AM sunrise color temperature is 1800K while the sunset is 16,000K. Both contain visible and infrared sunlight. But the color temperature of solar light varies tremendously from sunrise to sunset. This is tied to the blue light present within the light. For example, at my 28 latitude in winter time we have only 13% blue light in our light but in the summertime, it rises to 26%. This has huge implications on the types of foods that can and cannot grow at times of the year. That light signal must be coherent via the skin in the eye to register properly in the gut and mitochondria. Color temperatures over 5000 K are called “cool colors” by indoor lighting convention and are bluish white, while lower color temperatures (2700–3000 K) are called warm colors which are yellowish white through red.
...
The Sun closely approximates a black-body radiator. The effective temperature, defined by the total radiative power per square unit, is about 5780 K. The color temperature of sunlight above the atmosphere is about 5900 K. This is usually the color temperature of sunlight at solar noon and not all day. Solar variation is important to cells.

As the Sun crosses the sky, it may appear to be red, orange, yellow or white depending on its position in the sky. This varies by altitude and latitude. I believe the major variation today is now affected by population density as well. The changing color of the Sun over the course of the day is mainly a result of scattering of light in our atmosphere and is not due to changes in black-body radiation. The blue color of the sky is caused by Rayleigh scattering of the sunlight from the atmosphere, which tends to scatter blue light more than red light. The reason is simple. Scattering of light is inversely proportional to the 4th root of the wavelength of light. Since blue light has more power than red light, it scatters most and this is why the sky is blue on Earth. Blue light also bends more than any other frequency that enters the anterior chamber of the eye, so this causes a blue light aberration. It means that blue light is focused anterior to the retina in the eye BY DESIGN. This is why the melanopsin receptor and a large amount of retinol are in these areas of the retina."

https://www.lightstalking.com/a-beginners-guide-to-colour-temperature/
"...the Kelvin scale also measures the colour of light. The science of this is somewhat complicated but put in it’s simplest terms, if you have a pure black radiating object and heat it up until it is glowing when the temperature is below 4000K it will appear reddish, above 7500K it will seem bluish."

"...the shade on a sunny day around midday is around 5500K, however, if clouds start to obscure the sun, the colour temperature will go up to 6000K-7000K – this is quite a bit bluer."
____________

"When a beam of sunlight strikes a molecule in the atmosphere, what's called "scattering" occurs, sending some of the light's wavelengths off in different directions. This happens millions of times before that beam gets to your eyeball at sunset.

The two main molecules in air, oxygen and nitrogen, are very small compared to the wavelengths of the incoming sunlight—about a thousand times smaller. That means that they preferentially scatter the shortest wavelengths, which are the blues and purples. Basically, that's why the daytime sky is blue. The daytime sky would actually look purple to humans were it not for the fact that the sensitivity of our eyes peaks in the middle [green] part of the spectrum—that is, closer to blue than to purple.

But at sunset, the light takes a much longer path through the atmosphere to your eye than it did at noon when the sun was right overhead. And that is enough to make a big difference as far as our human eyes are concerned. It means that much of the blue has scattered out long before the light reaches us."
______________

But: Shorter wavelength means higher light temperature. And that is the connection between the two phenomena."
and
"The sky is blue because different wavelengths of light are scattered more at the blue end of the spectrum by air molecules and water vapour in the atmosphere.

At sunset, light must travel further through the air than at noon, to reach your eyes, so more blue is scattered, leaving only red to penetrate through to your eyes.

Sunsets are red (so is a dawn sunrise) for the same reason the sky is blue, not because of any correlation to the colour temperature chart."
___________

Sunsets have a much higher colour temperature than sunrise and solar noon, does that mean Sunsets are more stronger in blue wavelengths when compared to sunrise and solar noon?"

Jack's response:
"yes. ThAT IS the target of the melanopsin receptor 435-465nm dominates the last hour of sun in a day and this is a crescendo stimulus and then it falls immediately to zero K and when that happens the clock of melatonin release in pineal begins."

I think I was wrong about the color temperature around sunset being low like around sunrise. Or, there are other details that should be included I didn't know. I'm not sure what to conclude about the info but here's some I found.

Someone asked Dr. Jack Kruse on the Vermont 2017 video on the comments section: "Why are sunsets so important to a mitochondriac?"

Dr. Jack Kruse replied:
"Because the color temperature of PM light rises and this is the blue crescendo photic stimulus to the melanopsin/retinol system and signals the origin of activation of melatonin during darkness after its aromatic rings were initially excited by AM IR-A and UV-A light. This is also a big leptin and amylin trigger too for the same reasons."
______________

Some more info from Jack:

https://jackkruse.com/reality-2-can-life-skirt-uncertainty-principle-second-law-thermodynamics/
"The photons come in all colors or frequencies because the sun’s light varies by location altitude and time of day. For example, the AM sunrise color temperature is 1800K while the sunset is 16,000K. Both contain visible and infrared sunlight. But the color temperature of solar light varies tremendously from sunrise to sunset. This is tied to the blue light present within the light. For example, at my 28 latitude in winter time we have only 13% blue light in our light but in the summertime, it rises to 26%. This has huge implications on the types of foods that can and cannot grow at times of the year. That light signal must be coherent via the skin in the eye to register properly in the gut and mitochondria. Color temperatures over 5000 K are called “cool colors” by indoor lighting convention and are bluish white, while lower color temperatures (2700–3000 K) are called warm colors which are yellowish white through red.
...
The Sun closely approximates a black-body radiator. The effective temperature, defined by the total radiative power per square unit, is about 5780 K. The color temperature of sunlight above the atmosphere is about 5900 K. This is usually the color temperature of sunlight at solar noon and not all day. Solar variation is important to cells.

As the Sun crosses the sky, it may appear to be red, orange, yellow or white depending on its position in the sky. This varies by altitude and latitude. I believe the major variation today is now affected by population density as well. The changing color of the Sun over the course of the day is mainly a result of scattering of light in our atmosphere and is not due to changes in black-body radiation. The blue color of the sky is caused by Rayleigh scattering of the sunlight from the atmosphere, which tends to scatter blue light more than red light. The reason is simple. Scattering of light is inversely proportional to the 4th root of the wavelength of light. Since blue light has more power than red light, it scatters most and this is why the sky is blue on Earth. Blue light also bends more than any other frequency that enters the anterior chamber of the eye, so this causes a blue light aberration. It means that blue light is focused anterior to the retina in the eye BY DESIGN. This is why the melanopsin receptor and a large amount of retinol are in these areas of the retina."

https://www.lightstalking.com/a-beginners-guide-to-colour-temperature/
"...the Kelvin scale also measures the colour of light. The science of this is somewhat complicated but put in it’s simplest terms, if you have a pure black radiating object and heat it up until it is glowing when the temperature is below 4000K it will appear reddish, above 7500K it will seem bluish."

"...the shade on a sunny day around midday is around 5500K, however, if clouds start to obscure the sun, the colour temperature will go up to 6000K-7000K – this is quite a bit bluer."
____________

"When a beam of sunlight strikes a molecule in the atmosphere, what's called "scattering" occurs, sending some of the light's wavelengths off in different directions. This happens millions of times before that beam gets to your eyeball at sunset.

The two main molecules in air, oxygen and nitrogen, are very small compared to the wavelengths of the incoming sunlight—about a thousand times smaller. That means that they preferentially scatter the shortest wavelengths, which are the blues and purples. Basically, that's why the daytime sky is blue. The daytime sky would actually look purple to humans were it not for the fact that the sensitivity of our eyes peaks in the middle [green] part of the spectrum—that is, closer to blue than to purple.

But at sunset, the light takes a much longer path through the atmosphere to your eye than it did at noon when the sun was right overhead. And that is enough to make a big difference as far as our human eyes are concerned. It means that much of the blue has scattered out long before the light reaches us."
______________

But: Shorter wavelength means higher light temperature. And that is the connection between the two phenomena."
and
"The sky is blue because different wavelengths of light are scattered more at the blue end of the spectrum by air molecules and water vapour in the atmosphere.

At sunset, light must travel further through the air than at noon, to reach your eyes, so more blue is scattered, leaving only red to penetrate through to your eyes.

Sunsets are red (so is a dawn sunrise) for the same reason the sky is blue, not because of any correlation to the colour temperature chart."
___________

Sunsets have a much higher colour temperature than sunrise and solar noon, does that mean Sunsets are more stronger in blue wavelengths when compared to sunrise and solar noon?"

Jack's response:
"yes. ThAT IS the target of the melanopsin receptor 435-465nm dominates the last hour of sun in a day and this is a crescendo stimulus and then it falls immediately to zero K and when that happens the clock of melatonin release in pineal begins."

So is it constantly rising to 16000K or do you get the 16000K peak only when the sun is set and the sky turns blueish? Because the sunlight temperature from noon on feels like going to warmer colors and that would be down again to 1600K.

It is a 10- or 14-inch-diameter sheet-metal tube with polished interior. Because of its internal reflectivity, it acts like a continuous mirror from roof to room, channeling daylight along its entire length (and keeping the light intensity intact).

Unfortunately, this is not a cheap hack, since cost of materials and installation for one tube can run $500 ->$1000 (but much cheaper if you DIY). Well worth it in my opinion, but I also realize not everyone's pockets are stuffed with ready cash.

Of course, the sunlight is gone at night so you will need supplemental artificial light then.

I have literally spent 2 1/2 hours searching for a full-spectrum incandescent light bulb that is under 3000 kelvin and not dimmable. I have found not one. Can someone direct me to a brand and website where I can order such a bulb? I looked up 12-volt DC Reflector light bulb and they are under 3000 kelvin, but they are not full-spectrum and they are LED, which I understood we are to stay away from. HELP!

1. Color temperature of the light should be below 3000K
2. Strict avoidance of Fluorescents and LED's
3. If you use a black like CFL make sure you are not Mercury toxic.
4. We need to measure color temperature using the physics standards of black box techniques and stop using the CIE 1931 Standards. (hard for the general public to do now)
5. Use no frequency modulation of the device. This is dimmers and controls. This causes more complicated electric and magnetic fields and introduces flicker effect.
6. A 12 volt DC reflector lamp meets all these requirements for todays market.

The daytime bulb, perhaps the Exo-Terra Sunray metal hallide?
No colour temp info provided, but has UVB and UVA, spectrgraph seems to have no spikes in the blue... but not 3rd party verified.
supposedly a long-lasting bulb (2 years?), but need to purchase the ballasted fixturehttp://www.exo-terra.com/en/products/sunray_bulb.php

The daytime bulb, perhaps the Exo-Terra Sunray metal hallide?
No colour temp info provided, but has UVB and UVA, spectrgraph seems to have no spikes in the blue... but not 3rd party verified.
supposedly a long-lasting bulb (2 years?), but need to purchase the ballasted fixturehttp://www.exo-terra.com/en/products/sunray_bulb.php

Strength chart:[/QUOTE
depending on how early your using this light colour temp might be too much and there is no uv at sunrise. obviously you should be getting natural light at dawn no matter what the weather.